Energy

The joule (IPA pronunciation: [dʒuːl] or [dʒaʊl]) (symbol: J) is the SI unit of energy. It was named after James Prescott Joule for his work on the relationship between heat and mechanical work. Read more

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Broadly speaking, energy refers to "the potential for causing a change". There are different forms of energy. Many forms of energy refer to changes in movement of objects or their potential for causing other kinds of change. Hence, in the real world, energy can be viewed as the ability to perform an action. Read more